Melangyna olsufjevi ( Violovitsh, 1956 )

Kim, Chan-Ouk, Hwang, Seul-Ma-Ro & Han, Hak-Seon Lee and Ho-Yeon, 2022, Ten species of the tribe Syrphini (Insecta: Diptera: Syrphidae) newly recorded in Korea, Journal of Species Research 11 (3), pp. 208-237 : 226-227

8. Melangyna olsufjevi ( Violovitsh, 1956)

ğêņśDZḋỵỄOi (ljḑ) ( Figs. 3G- I , 6D- F ) Syrphus olsufjevi Violovitsh, 1956: 742 (type locality -

Russia, south Sakhalin ; holotype ♂, ZISP). Syrphus (Melangyna) olsufjevi : Violovitsh, 1976: 328

(in Siberian catalog); Violovitsh, 1983: 40 (in Siberian key).

Melangyna olsufjevi : Hippa, 1968: 18 (n. comb. from Syrphus , redescription); Nielsen, 1971: 66 (redescription); Peck, 1988: 28 (in Palaearctic catalog); Mutin and Barkalov, 1997: 190 (in review of Sakhalin and Kuril Islands syrphids); Mutin and Barkalov, 1999: 390 (in Russian Far East key); Ȏhara et al., 2014: 474 (in Japanese catalog); Mutin et al., 2016: 21 (in list of Tumnin River area, Russia); Barkalov and Mutin, 2018: 497 (in Russian checklist); Barkalov and Tridrikh, 2021: 310 (in checklist of Magadanskaya, Russia).

Melangyna lasiophthalma [misidentification]: Han and Choi, 2001: 48 (in Korean checklist); Choi et al., 2018: 77 (in Korean checklist).

Diagnosis. Melangyna olsufjevi can be distinguished from East Asian congeners by the following combination of characteristics [modified from Mutin and Barkalov (1999)]: 1) compound eye densely covered with relatively long brownish-yellow hairs ( Fig. 3G ); 2) face brownish yellow with brownish-black vertical facial stripe ( Fig. 3G ); 3) tibiae almost entirely brownish yellow ( Fig. 3I ); and 4) tergite 2 laterally with pair of small transversely ovate brownish yellow spots, each of less than 1/4 of tergite width ( Fig. 3H ).

Description of Korean material. Male. Lengths and ratios: body length 9.9-10.4 mm; wing length 9.1-9.6 mm; head ratio 0.71-0.73; face ratio 0.51-0.57; eye ratio 0.57-0.59; gena-eye ratio 0.15-0.18; antenna-head ratio 0.38-0.44; postpedicel-pedicel ratio 2.38-2.93; arista-antenna ratio 0.91-1.13; wing ratio 3.42-3.48; wing-thorax ratio 2.50-2.85; vein M ratio 3.14-3.79; vein R 4+5 ratio 3.94-4.64. Head holoptic with eye contiguity about 0.75 × as long as vertical triangle ( Fig. 3H ); compound eye dark brown with slight purplish tinge, densely covered with brownish-yellow hairs ( Fig. 3G ); vertex black, postero-marginally with yellowish-white pruinosity, largely with slightly wavy black hairs but postero-marginally with brownish-yellow hairs; frons black with grey pruinosity, with black hairs (some long hairs slightly wavy) ( Fig. 3G, H ); lunule dorsally brownish black to black, ventrally brownish yellow, bare ( Fig. 3G ); antenna largely brownish black; face largely brownish-yellow ground color with grey pruinosity, largely with black hairs but lower part mixed with some yellow hairs, and with brownish-black vertical facial stripe from lower facial margin up to almost adjacent to the antennal sockets, about 0.3 × as wide as facial width (upwardly slightly narrowed) ( Fig. 3G ); facial knob rounded, almost bare; gena brownish black with grey pruinosity, anteriorly with black hairs, posteriorly with pale yellow hairs ( Fig. 3G, I ). Thorax largely blackish with yellowish-grey to grey pruinosity, with wavy brownish-yellow to pale yellow hairs ( Fig. 3H ); lateral margins of scutum slightly matte yellowish grey; scutellum largely brownish yellow to brown except for brownish black anterior to lateral margins (having relatively wide brownish black baso-ventral corners), largely with wavy brownish yellow to pale yellow hairs but postero-marginally mixed with a few black hairs ( Fig. 3H, I ); pleura blackish, mostly with yellowish grey to grey pruinosity ( Fig. 3I ), anterior anepisternum, anterior 1/4- 1/3 of posterior anepisternum, dorsomedial anepimeron, posterior anepimeron, meron, anatergite, mediotergite and metasternum bare; katepisternum with upper and lower wavy pale yellow hair patches, narrowly connected on posterior margin; halter brownish yellow to brown. Legs with coxae and trochanters brownish black with variably mixed black and brownish-yellow hairs ( Fig. 3I ); fore and mid femora basally brownish black, apically brownish yellow, largely with brownish-yellow hairs but posteriorly mixed with black hairs; hind femur largely brownish black except for brownish yellow apex, largely with brownish-yellow hairs but apically with short black hairs; fore and mid tibiae almost entirely brownish yellow but subapically slightly darkened, with short brownish-yellow hairs (sometimes apically mixed with a few black hairs); hind tibia largely brownish yellow but subapically slightly darkened, largely with short black hairs but postero-ventrally with short brownish-yellow hairs; tarsi basally brownish yellow, apically dark brown, dorsally with short black hairs, ventrally with short brownish-yellow hairs. Wing largely hyaline with slight pale brownish tinge ( Fig. 3H ); veins pale brown to brownish black; pterostigma pale brown; cell sc before pterostigma yellowish; wing membrane entirely microtrichose (sometimes with narrow bare area on baso-anterior margin of cell br); upper and low- er calypters pale yellow to brownish yellow with long brownish-yellow marginal hairs. Abdominal tergites unmargined, black ground color with brownish-yellow markings, and with wavy brownish-yellow and black hairs (wave getting weaker towards apex) ( Fig. 3H ); tergite 1 subshiny black; tergite 2 laterally with pair of small transversely ovate brownish-yellow spots, each of less than 1/4 of tergite width, spots separated from lateral margins; tergites 3 and 4 each antero-laterally with pair of brownish-yellow transverse stripes, each of about 2/5-3/7 width and 1/3-2/5 length of tergite, stripes separated from lateral margins; tergites 3 and 4 also with very narrow brownish-yellow posterior margins; tergite 5 largely black except for narrow brownish-yellow lateral and posterior margins; sternite 1 largely brownish black except for brownish-yellow posterior margin, with wavy pale yellow hairs; sternites 2-4 largely brownish black subanteriorly with pair of brownish-yellow to pale yellow spots, posterior margin brownish yellow, with pale yellow to brownish-yellow hairs (sometimes posteriorly mixed with some black hairs); sternites 5-8 brownish black with black hairs. Male genitalia ( Fig. 6D- F ) with epandrium about 1.5 × as long as height, anteriorly distinctly shortened of about 1/3 of posterior height in lateral view ( Fig. 6E ); surstylus relatively long and narrow in caudal view (middle width about 1/3 of length when oriented to show broadest area) ( Fig. 6D ), slightly curved anteriorly with rounded apex in lateral view, basally with long brownish-yellow hairs, apically with short hairs ( Fig. 6E ); hypandrium with apically slightly down-curved lingula ( Fig. 6E ); lateral protuberance of hypandrium as long as lingula with rounded apex; area between lateral protuberance and lingula slightly wavy ( Fig. 6 E-a); distiphallus relatively narrow and short, about 1/4 as long as aedeagal complex, about basal 2/3 almost parallel-sided, apical 1/3 ventrally widened in lateral view ( Fig. 6F ); distiphallus apico-marginally with short spiny hairs; antero-dorsal corner of basiphallus sharply bent at 90° in lateral view ( Fig. 6F ); basiphallus only with single pair of pointed apico-ventral processes; apico-ventral processes distinctly close to each other, basally widened outwardly in caudal view. Female. Unavailable, but according to Mutin and Barkalov (1999), female seems to resemble male, only except for the dichoptic head.

Material examined. KOREA: Gangwon-do: Hoengseong-gun, Anheung-myeon , Mt. Chiaksan , from Gangrim 4-ri to Cheonjibong (1,086 m), N37°23 ʹ 51 ʺ E128° 05 ʹ 23 ʺ, 28.IV.2000, D.-S. Choi, S.-K. Kim, 5♂ (1♂ in NIBR) ; Hoengseong-gun, Dunnae-myeon, Sapgyo-ri , Mt. Cheongtaesan , N37°30 ʹ 40 ʺ E128°18 ʹ 01 ʺ, 3.V.2003, H.-W. Byun, J.-S. Soh, 1♂ ; Wonju-si, Heungeop-myeon, Maeji-ri , Yonsei Univ. Mirae Campus , N37°17 ʹ 10 ʺ E127°54 ʹ 01 ʺ, 24.III.2001, C.-H. Park, O.-Y. Lim, 1♂ ; ditto, 13.III.2002, H.-S. Lee, 1♂ ; ditto, 27.III.2002, H.- S. Lee, 1♂ ; 20.III.2003, D.-S. Choi, H.-S. Lee, 1♂; ditto, 15.IV.2006, D.-S. Choi, H.-W. Byun, 1♂ ; Jeollabuk-do: Jeonju-si, Jungin-dong, Mt. Moaksan , 5.IV.2009, H.-S. Lee et al., 1♂ .

Distribution. Russian Far East including Sakhalin, Japan, Korea.

Biology. Female is known to visit Salix bebbiana Sarg. flowers in Russia ( Mutin et al., 2016).

Remarks. The examined Korean males of M. olsufjevi agree well with the original description ( Violovitsh, 1956) and redescriptions ( Hippa, 1968; Nielsen, 1971). Female is currently not available in Korea. The new Korean name of this species translates as “ Melangyna fly with two small spots” referring to its two small spots on tergite 2.

Figures

Fig. 3. A-F.Fagisyrphus cinctus (Fallén, 1817):(A, C) male body, dorsal and lateral view;(B) male abdomen, ventral view; (D) male head, frontal view;(E, F) female body, dorsal and lateral view(F-a: hind margin of wing, about 100× of original figure). G-I. Melangyna olsufjevi (Violovitsh, 1956):(G) male head, frontal view; (H, I) male body, dorsal and lateral view. J-L. Melangyna pavlovskyi(Violovitsh, 1956):(J, L) male body, dorsal and lateral view;(K) male abdomen, dorsal view. M-S. Paragus clausseni Mutin, 1999:(M) male head, frontal view; (N, P) male body, dorsal and lateral view; (O) male abdomen, ventral view; (Q) female head, frontal view; (R, S) female body, dorsal and lateral view. Voucher specimen codes: A-C - FagCin_M2; D - FagCin_M1; E, F - FagCin_F1; G - MlnOls_M2; H, I - MlnOls_M1; J-L - MlnPav_M1; M, N, P - PagCla_M1; O - PagCla_M2; Q-S - PagCla_F1.

Fig. 6. Male genitalia. A-C. Fagisyrphus cinctus (Fallén, 1817): (A) caudal view; (B) lateral view; (C) aedeagus, lateral view. D-F. Melangyna olsufjevi (Violovitsh, 1956): (D) caudal view; (E) lateral view; (F) aedeagus, lateral view. G-I. Melangyna pavlovskyi (Violovitsh, 1956):(G) caudal view; (H) lateral view; (I) aedeagus, lateral view. J-L. Paragus clausseni Mutin, 1999: (J) caudal view; (K) lateral view; (L) aedeagus, lateral view. Scale bars: 0.3 mm. Voucher specimen codes: A-C - FagCin_M2; D-F - MlnOls_M2; G-I - MlnPav_M1; J-L - PagCla_M2.